John Volanthen, from Bristol, was one of a number of foreign expert divers drafted in for the rescue of 12 boys and their football coach who had been trapped in a Thai cave for nine days.
He tells BBC Points West about the moment he and his fellow divers first discovered the children alive.
Mr Volanthen, a member of the South and Mid Wales Cave Rescue Team, said they knew they had found them due to the smell in the cave.
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